<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>立即执行函数</title>
  </head>
  <body>
    <script>
      (function (a, b) {
        console.log("我是立即执行函数");
        console.log("a+b=", a + b);
      })(5, 7);

      function text() {
        console.log("我是普通函数");
      }
    </script>
  </body>
</html>
